Final answer:
In the story 'The Monkey's Paw' by W.W. Jacobs, Mrs. White inferred that her son had been killed when she nodded in response to a statement about her husband having the guests murdered.
Step-by-step explanation:
In the story 'The Monkey's Paw' by W.W. Jacobs, Mrs. White inferred that her son had been killed when she nodded in response to the question, 'Do you mean to say that your father had them murdered before they left?' This statement suggests that Mrs. White's son was killed by her husband to prevent the possibility of him returning as a result of using the monkey's paw to make a wish.